Upgrade does not work with CAeAC-1281-1.0.2988.s390x.rpm package

I get an error message when I tried to use -U option with CAeAC-1281-1.0.2988.s390x.rpm package.

# rpm -U CAeAC-1281-1.0.2988.s390x.rpm

This does not work when the existing version CAeAC-1281-1.0.2265 is still installed. I can install the package after I have removed CAeAC-1281-1.0.2265, but still I need to use rpm -U option, rpm -i does not work.